Remember it's never going to be perfect due to lenses, distortion and tracking accuracy of the features.
请记住，透镜、畸变和特征点的跟踪精度将使它永远不会完美。
2
In tracking, the area of face contour distortion were searched by the method of particle filter, and the face contour parameters were solved.
同时，利用非线性滤波方法在人脸轮廓的变形区域内进行搜索，求解人脸轮廓参数，进行人脸轮廓跟踪。
3
State feedback pole assignment technique is used to gain fast tracking of the output voltage, and a repetitive control is designed to reduce voltage distortion under nonlinear loads.